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Scala is reaching a tipping point, as thousands of Java and other object-oriented programmers hear about its potential and seek to discover this breakthrough functional programming language for themselves. Until now, most treatments of Scala have been abstract and academic. Now, Cay Horstmann does for Scala what he did for Java in his global best-seller Core Java: he offers a rapid, code-based introduction that's relentlessly practical and 100% useful. Every concept and technique in Scala for the Impatient is presented in "blog-size" chunks that can be digested quickly and reviewed as needed for specific tasks. Horstmann offers hands-on activities that guide readers through four well-defined stages of competency: